Yeah I dont normally use lights or heat lamps at all... Last year when we got all that snow mine kept laying just fine... The only time I have ever used lights is when it got into the low teens at night and was only in the low 20's during the day and it was like that for a week. And I agree to have all 15 stop at once is really strange... Hopefully they figure it out soon cuz my 3 year old will no longer eat store bought eggs and he loves his egg bagels in the am.... lol